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数值实验中基于matlab的龙格算法(Numerical experiments of Runge matlab-based algorithm)

this code very good for PPCASOM

说明：  双馈风力发电系统的PSCAD仿真模型。大家学习下。(Wind PSCAD power system simulation model. We learn next.)

本文区别于其他传统的人口预测模型，深入分析了当前中国人口的基本情况，以及 最近几年中国人口的发展情况与趋势，针对中国人口基数大、男女比例不协调、乡村人 口城镇化加速、人口老龄化日益严重等显著特点，在各年龄段生育率短期内保持不变的 假设下，建立基本的人口转移回归模型，用于模拟预测短期内中国各类人口数量发展变 化。该模型预测结果显示，中国人口在未来十几年内增长一定幅度后开始下降；与此同 时，人口老龄化、男女比例失调等问题日益严重。该模型短期内的预测效果比较好。 为了使中国将来的人口发展健康、平衡，综合考虑中国以及欧洲一些发达国家和亚 洲一些实行计划生育较早的国家以前以及当前的一些情况，本文提出了修改计划生育政 策的建议。面对日益严重的老龄化现象，我们提出生育率应该参考老龄人口比例这一新 思想，并建立生育率与老龄人口比例的关系模型，用于长期人口的预测。预测结果显示 中国总人口在短期内持续上升，在2025 年到2040 年之间基本保持在14.6 亿的最大值， 然后开始缓慢下降。 两个模型的结果均显示，中国将会面临严重的老龄化和男女比例不协调两个问题。 最后我们提出了适当措施以缓和这两个问题带来的影响。(This is different from other traditional population projection model, in-depth analysis of the current basic situation of China s population, and In recent years the development of China s population and the trend for China s huge population, gender disharmony, rural people I accelerated urbanization, the growing aging population and other significant features in the short term fertility of all ages remain unchanged Assumption, the establishment of basic population transfer regression model, to simulate and predict the short term development of China s various types of population change Of. The predicted results show that China s population growth in the next decade began to decrease after a certain extent and the same When an aging population, gender imbalance and other growing problem. The model predicted the short-term results were better. To make the development of China s future population health, balance, considering China and some developed countries in Europe and A)

MATLAB锁相环仿真模型，功能齐全，保证精品，(MATLAB simulation phase-locked loop)

一种频率域计算天然地震接收函数的程序，matlab程序(A method which calculate the receiver-function in frequency )

程序实现二维Airy beam的轨迹控制，通过改变wm和wg的值，可控制Airy beam的最大光强在传输轨迹中的任意位置，可观察光束光强的三维分布(Airy beam program implements the two-dimensional locus control by changing the values of wm and wg, controlled Airy beam of the maximum light intensity transmitted anywhere in the track, the light beam can be observed three-dimensional distribution of light intensity)

基于Mie理论的球形介质monte carlo模拟多次散射，包括：绝缘球的平面波散射和多层覆盖介质球的平面波散射。(This package contains the code that implements the field solutions as a) a planewave is scattered by a dielectric sphere, b) a planewave is scattered by a multi-layer concentric sphere. )

三维模型数据中包含“Princeton Shape Benchmark dataset”，三维模型数据库，其中的.off文件为三维模型，这些模型可以使用文件夹中的“打开三维模型的软件”打开查看。 matlab代码中“读取三维模型”为matlab读取.off文件的代码，得到的是三角面片信息和点云坐标 “三维模型切割”中为切割三维模型的一个例子，具体是从三维模型上找三个点构成一个平面，找到这个平面与三维模型的交点，这只是一个例子，具体如何切割三维模型需要自己实现，其中读取的三维模型为.obj格式，实验时需要把这部分换成上面读取.off的代码。运行其中的cut.m和cut2.m文件 “CBSM特征提取”用于提取形状特征，a.m是批量提取的，b.m是提一张图片的(3D model data contained in the Princeton Shape Benchmark dataset , the three-dimensional model , which .off file three-dimensional models that can be used in the folder open a 3D model of software Open View. matlab code reads the three-dimensional model for the matlab code to read .off file to obtain a triangular facets information and coordinate point cloud Three-dimensional model of cutting as an example of cutting three-dimensional model, in particular to find a three-dimensional model the three points form a plane, find the intersection of the plane and three-dimensional model, this is just an example of how to cut specific need to implement three-dimensional model wherein the three-dimensional model is read .obj format, experiments need to replace this part of the above read .off code. Run one of the cut.m and cut2.m file CBSM feature extraction is used to extract the shape feature, a.m bulk extraction, b.m is to provide a picture o)

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